WO1995007830A1

WO1995007830A1 - Wiper arm

Info

Publication number: WO1995007830A1
Application number: PCT/EP1994/002875
Authority: WO
Inventors: Eduard Schill; Eckhardt Schmid; Siegfried Waible; Jürgen BOMMER
Original assignee: Itt Automotive Europe Gmbh
Priority date: 1993-09-17
Filing date: 1994-08-31
Publication date: 1995-03-23
Also published as: EP0717688B1; KR100330561B1; DE59408397D1; DE4331602A1; EP0717688A1; JPH09502678A; ES2132428T3

Abstract

The invention relates to a wiper arm consisting of a securing section (1) with a substantially U-shaped cross-section and a hinged section (2) with a substantially U-shaped cross-section with a wiper rod (3). The side faces (12) of the hinged section (2) are fitted between the overlaps (7) formed at the end of the side faces (6) of the securing section (1) and are pivotatably secured together by a hinge pin (9) inserted in the aligned drillings in the side faces (6, 12).

Description

Wiper arm

The invention relates to a wiper arm, in particular for a window cleaning system of a vehicle, according to the features from the preamble of claim 1.

In today's automobile construction, it is customary for windshield wiper systems to be installed in the vehicle body in such a way that the wiper shafts on which the wiper arms are fastened are covered by body parts, such as, for example, the bonnet. Wiper arms then pass through a relatively narrow space between the hood and the windshield, so that the wiper blades on the windshield can perform their cleaning function. On the other hand, in order to enable the wiper arm to be folded down from the windshield from time to time, as is very useful, for example, for replacing the wiper blade, the pivot bearing must usefully be located outside the hood. This in turn requires a relatively long fastening part.

From DE-OS 37 24 777 a wiper arm with a relatively long fastening part is already known. This fastening part is produced in a die-casting process from a zinc alloy and essentially has a U-shaped cross section. It has a back from which two side cheeks extend in the direction of the pane to be cleaned. To increase stability, various stiffening ribs run between the side cheeks and the back. At one end the fastening part is provided with a bore for fastening on a wiper shaft and at the other end a joint part is fastened via a swivel bearing. The joint part consists of sheet steel and is essentially chen U-shaped with a back and two side panels facing the window to be cleaned. A bearing bush is inserted into aligned bores in the side cheeks of the fastening part to form the swivel bearing. In the area of the pivot bearing, the side cheeks of the fastening part are surrounded on the outside by extensions of the side cheeks of the joint part, these extensions also being provided with aligned bores. A hinge pin is inserted into the aligned holes and the bearing bush and forms the swivel axis.

Since very large windows have to be cleaned in modern vehicles, very large contact forces are required for the wiper blade, which is attached to the end of the wiper rod attached to the joint part. In DE-OS 37 24 777 these contact forces are generated by two tension springs arranged in parallel, which are suspended on the one hand on the wiper rod and on the other hand on the fastening part. The wiper arm is therefore exposed to very high mechanical stresses, which has a disadvantageous effect in particular on the relatively long fastening part made of die-cast zinc. Under these continuously acting tensions, intensified when there is a great deal of heat in the summer months, the fastening part is deformed excessively, which can lead to malfunctions.

In order to eliminate this disadvantage, it has already been proposed to produce the fastening part from sheet metal. Such a wiper arm is known from DE-OS 41 36 938. The fastening part and the joint part are made of sheet metal and each have an essentially U-shaped cross section, that is to say they have a back and side cheeks pointing in the direction of the pane to be cleaned. In the area of the swivel bearing, the side cheeks of the joint part are extended and encompass the outside of the side cheeks of the fastening part, in which area the side cheeks of fasteners Stigungsteil and hinge part or their extensions are provided with aligned holes. The bores of the fastening part are equipped with a bearing bush in which a hinge pin or hinge pin can be rotatably mounted. A hinge pin or hinge pin is inserted into the bores of the hinge part and the bearing bush of the fastening part and held in a rotationally fixed manner on the hinge part. The required contact pressure is in turn generated by a tension spring acting between the wiper rod and the fastening part. The main disadvantage of this wiper arm is that the fastening part is narrower in the region of the pivot bearing than the joint part, which has a disadvantageous effect on the stability of the construction, in particular in the region of the pivot bearing.

In addition, the geometry of the individual parts in the solutions described requires that the parts of the wiper arm have to be painted before they are assembled, because after the assembly relatively large surface areas cannot be reached using cost-effective painting processes. On the other hand, damage to the lacquer layer cannot be ruled out during the assembly of the individual parts, as a result of which at least partial re-painting would be necessary.

The object of the invention is to develop a wiper arm of this type so that it has the required stability and is inexpensive to manufacture.

According to the invention, the object is achieved by a wiper arm with the features of the preamble of claim 1, in which, in the region of the common pivot bearing of the fastening part and the joint part, the side cheeks of the joint part or the extensions of these side cheeks between the side cheeks of the fastening part or the extensions thereof Sidewalls are arranged. In other words, pressed, in the area of the pivot bearing the side walls of the joint part or their extensions are encased on the outside by the side walls or extensions of the side walls of the fastening part. The fastening part, which transmits the torque of the wiper shaft to the joint part with a wiper rod, is thus wider and thus more stable than the joint part. In addition, this part geometry creates the possibility of painting the wiper arm only after the individual parts have been assembled. The production of the warmth becomes cheaper.

It is advantageous for the stability of the wiper arm if, according to claim 2, the back of the fastening part has the same width over the entire length of the fastening part. A particularly high stability of the wiper arm in relation to the various acting forces and mechanical stresses is achieved if both the joint part and the fastening part are made from sheet steel.

If, according to claim 4, a separate or a common bearing bush is inserted into the aligned bores of the joint part in connection with the formation of the pivot bearing, in which a joint pin or the like can then be rotatably arranged, this measure serves in particular to reduce wear in the bearings but also increasing the stability of the pivot bearing.

When the side cheeks of the fastening part or their extensions are formed in the area of the pivot bearing as coverings in accordance with claim 5 in such a way that when the wiper arm is folded up from the vehicle window, essentially no surface areas of the side cheeks of the joint part or their extensions become visible can, which in the starting position from the overlaps are concealed, in particular the quality of the painting which takes place after the wiper arm has been assembled is improved. An optimal external appearance of the wiper arm and good surface protection are achieved in this way - on the other hand, the production outlay and the costs are in no case greater than with the known wiper arms.

It is also advantageous if, according to claims 6 and 7, the edge of the overlaps is curved in their essential effective area and is curved from above the bore for the hinge pin or the like on the side pointing in the direction of the wiper rod to below Bore for the hinge pin or the like extends. From there, the edge can then run downwards and merge into the lower edge of the side cheeks of the fastening part with a curve. This formation of the overlap in the area of the pivot bearing achieves the required great stability of the construction and the required lateral guidance for the joint part with a wiper rod.

The greatest security for the fact that over the entire possible folding area of the wiper arm, i.e. of the possible swiveling range of the joint part with wiper rod relative to the fastening part when the wiper arm is attached to the vehicle, no unpainted areas of the side cheeks of the joint part can be exposed if, according to claim 9, the edge of the overlap is circular and concentric runs to the hole for the hinge pin or the like.

An exemplary embodiment is explained in more detail below with the aid of the drawing. The drawing shows:

Figure 1 - a wiper arm in perspective and Figure 2 - an enlarged view from the area of the pivot bearing 13 of Figure 1

The entire wiper arm is composed of a fastening part 1 and a joint part 2 to which the wiper rod 3 is fastened. The wiper rod 3 is shown broken in FIG. 1, since it is generally known what such wiper rods 3 look like. The wiper blade known per se can be articulated at the end of the wiper rod 3, which is not shown.

The fastening part 1 is made of sheet steel, for example by deep drawing. It has an opening 4 with which the fastening part 1 is to be fastened on a pendulum-driven shaft. Overall, the fastening part 1 has at least an approximately U-shaped cross section, the back 5 running essentially perpendicular to the geometric axis of the opening 4 and the side cheeks 6, of which only one is visible in the drawing, essentially stretch vertically downwards from the back 5, ie are aimed at the pane to be cleaned. On the side of the fastening part 1 opposite the opening 4, the back 5 is set back somewhat in order to ensure the necessary pivotability of the joint part 2.

In the area between the opening 4 and the pivot bearing 13, which connects the fastening part 1 and the joint part 2 pivotably to one another, the joint part 1 is bent laterally. This deflection is dependent on the specific geometric conditions of the vehicle and on the geometry of the wiping field on the vehicle window dependent. Overall, the back 5 of the fastening part 1 is essentially the same width and wider than the back 11 of the joint part 2 over its entire length. This gives the fastening part 1 the required stability and strength, which also has an advantageous effect on the stability of the pivot bearing 13 and the entire wiper arm continues.

The side walls 6 of the fastening part 1 project beyond the back 5 in the direction of the wiper rod 3 on the side opposite the opening 4 and are designed in this area as a round cover 7. In each of these overlaps, a bore 8 is made coaxially, which receives a hinge pin or rivet 9. The edge 10 of the overlap 7 surrounds the bore 8 in an arc shape, specifically starting from above the bore 8 along the side of the bore 8 facing the wiper rod 3 to below the bore 8. From there, the edge runs a little further below and merges with a curve in the lower edge of the side cheek 6.

The joint part 2 is essentially U-shaped in cross-section, the side cheeks 12 (only one side cheek 12 being visible in the drawing) extending vertically downward from the back 11. This joint part 2 is also made of sheet steel. At the end of the joint part 2 opposite the wiper rod 3, a coaxial bore is also made in the side cheeks 12, which is not visible in the drawing. This end of the joint part 2 is arranged with its side cheeks 12 between the round overlaps 7 in such a way that all the bores in the side cheeks 6, 12 are aligned with one another. A hinge pin or rivet 9 is arranged in these bores and is thus the axis of the pivot bearing 13 formed.

A continuous bearing bush is advantageously inserted into the bores of the joint part 2 and connected to the joint part 2 in a rotationally fixed manner. The hinge pin or rivet 9 is thus within the holes 8 in the side walls 6 of the fastening part 1 and at the same time within the gerbuchse arranged and rotatably connected to the fastening part 1. The bearing bush can therefore be rotated together with the joint part 2 about the joint pin or joint rivet 9. In a known manner, a tension spring is attached to the fastening part 1 on the one hand and to the hinge part 2 or the pull rod 3 on the other hand, directly or via connecting links, and ensures the required contact pressure of the wiper blade on the window pane to be cleaned. These facts cannot be seen from the drawing because of the perspective representation, but because of their simplicity they are clear and understandable even without a graphic representation.

This wiper arm can only be painted without damage after it has been assembled, since even when the joint part 2 is pivoted relative to the fastening part 1, essentially no unpainted areas of the side cheeks 12 of the fastening part lying under the round cover 7 are exposed or become visible can.

Reference list

1 fastening part

2 joint part

3 wiper rod

4 opening

5 backs

6 side walls

7 coverage

8 hole

9 pivot pin or rivet

10 rand

11 back

12 sidewalls

13 swivel bearings

Claims

claims

1. wiper arm, in particular for a window cleaning system of a vehicle, with a fastening part (1) for fastening on a wiper shaft, with a joint part (2) which is connected to the fastening part (1) via a pivot bearing (13), and with a wiper rod (3) which is fastened to the end of the joint part (2) facing away from the pivot bearing (13), the fastening part (1) and the joint part (2) being made of sheet metal and essentially one U-like shape with a back (5, 11) and side cheeks (6, 2) pointing from the back (5, 11) to the window pane to be cleaned, and the swivel bearing (13) being aligned by bores (8) in the side cheeks (6, 12) of fastening part (1) and joint part (2) or in extensions of these side cheeks (6, 12), into which a

, Articulated pin (9) or the like is used, characterized in that in the region of the pivot bearing (13) the side cheeks (12) of the articulated part (2) or the extensions of these side cheeks (12) between the side cheeks (6) of the fastening part (1) or the extensions of these side cheeks (6) are arranged.

2. Wiper arm according to Claim 1, characterized in that the back (5) of the fastening part (1) has the same width over the entire length of the fastening part (1) in wesentli.

3. Wiper arm according to claim 1 or 2, characterized gekennzeich¬ net that both the fastening part (1) and the hinge part (2) are made of sheet steel.

4. Wiper arm according to one of claims 1 to 3, characterized - left

before a relative pivoting movement can be carried out on a hinge pin (9) or the like which is arranged fixedly in the aligned bores (8) of the fastening part (1).

Wiper arm according to one of claims 1 to 4, characterized in that in the region of the pivot bearing (13) the side cheeks (6) of the fastening part (1) or the extension of these side cheeks (6) with respect to the side cheeks (12) of the Articulated part (2) or the extensions of these side cheeks (12) are designed as covers (7) such that when the wiper arm is folded up from the pane to be cleaned there are essentially none in the starting position of the wiper arm from the overlaps ( 7) hidden surface areas of the side cheeks (12) of the joint part (2) or the extensions of these side cheeks (12) become visible.

Wiper arm according to Claim 5, characterized in that the edge (10) of the overlaps (7) is arcuate in their essential effective area.

Wiper arm according to Claim 6, characterized in that the edge (10) of the coverings (7) extends from above the bore (8) for the articulated pin (9) or the like on the side lying in the direction of the wiper rod (3) extends below the bore (8).

Wiper arm according to one of Claims 5 to 7, characterized in that the edge (10) of the overlaps (7) has an arc shape which deviates from the circular arc shape.

Wiper arm according to one of claims 5 to 7, indicates that the edge (10) of the overlaps (7) has the shape of a circular arc and the circular arc runs concentrically with the bore (8) for the articulated pin (9) or the like.